Open Yale CoursesCHEM 125: Freshman Organic ChemistryLecture 3 - Double Minima, Earnshaw's Theorem and Plum-Puddings<< previous session| next session >>Overview:Continuing the discussion of Lewis structures and chemical forces from the previous lecture, ProfessorMcBride introduces the double-well potential of the ozone molecule and its structural equilibrium. Theinability for inverse-square force laws to account for stable arrangements of charged particles is prescribed byEarnshaw's Theorem, which may be visualized by means of lines of force. J.J. Thomson circumventedEarnshaw's prohibition on structure by postulating a "plum-pudding" atom. When Rutherford showed that thenucleus was a point, Thomson had to conclude that Coulomb's law was invalid at small distances.Problem sets/Reading assignment:Reading assignments, problem sets, PowerPoint presentations, and other resources for this lecture can beaccessed from Professor McBride's on-campus course website, which was developed for his Fall 2008
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